/Engine/Source/Runtime/Online/Experimental/EventLoop/Public/EventLoop/EventLoopTimer.h
Adding and removing timers are thread-safe, however the timer callback and clear callbacks will both be called from within the Tick method, which may be a different thread. It is up to the user to handle thread safety within their callbacks.
template<typename Traits> class TTimerManager : public [FNoncopyable](API\Runtime\Core\Templates\FNoncopyable)